Stpne



" j STONE, of Man- Beft know thatILJQM. p o p jjchester, in the oountyofI-Iillsborough and OF MNCSTER? State oflhlew `Hampshire, have invented a new and" useful Improvement in Lathesfor Turning Locomotive-Drivers, `of which the following is affull, clear, `and exact description, referencegbeing @hadto the annexed drawings, making partof this specification,

. jin Whichi 3 Figure 1 is aplan oflfa lathe with my imf provements attached; Fig.2, a front view f ofthe face plate ofthe same; Fig. 3,\a view 1 of the foot stock; Figs. 4. 5,and 6,detached viewsl which will be referred to hereafter.

In inishinglocomotive drivers it is cus- `tomary after the tireis turned of to take them fromthe lathe` to another machine,

` Iwhere,`after` the points are carefully laid out, the holes for the wrist pins are bored. At othertimesthis isperformed by a de- `tached drill which is temporarily secured to theflathe for the purpose; but in this case `as before the points must rst be laid out,

andthis part ofthe operation requires to be "performed with extreme care and nicety, and consumes `considerable time, as 1t 1s necessary that `the two be at `exactly the same distance from the axis of the wheels,

and upon radii formingan angleof 90 j with each other. ..1

To dispense with` this portion of the opj j `eration is the object of my presentirivention, which consistsin mortising the face plate of the lathe "upon which the wheels are turned off, and` passing one of the drills through the opening so made. Another drill l for the purpo-sejof boringthe opposite wheel. beingm'ortisedthrough the foot stock,` in

a manner which will bepresently explained.

The axesjofthese drills are placed parallel to theaxis of the lathe, the one vertically beneath itand `the other a horizontal plane passing throughf` and `the drills are made capable of adjustment soas `to @bring` .them tot` exactlyjthe' same distance from the center of thewheels, `and also to `f accommodate them tolfditferent lengths of l stroke, andfthus "the two `wheels `may be` bored withextreme exactness, without the j inecessity oflayingout the points by hand as before mentioned, and without removing `the wheels `from `the centersupon which they havebeen turned. j

l To enable others skilled in the art touns larly those ,length of stroke.

ETEFOR TURNING Locoivro'rrvEmRIvERs.

` *zifspeifiatin af Letters Patent Nariavoa, dated April 1o, 1355.`

derstand invention and construct my machine Iwilll proceedtoexplain its con-` struction `and operation referring generally to thoseparts of the machine which do not differ materially Vfrom `other machines of the kind, and describing more particuparts whichare the subject of my invention.

In the accompanying drawings A is the head stock; B the face plate; C the mandrel upon which the wheels are centered; D the drill or cutters which project through the mortise F in the face late and is made capable of a sufficient horizontal motion to accommodate it to the diherent lengths of stroke in the following manner.

G is the shaft to which this 'drill is attached; this shaft is casedin the rectangular box E, which is allowed a vhorizontal side motion within certain limits, for the purpose lof regulating the distance of the drill from the mandrel.

In Fig. 6 is seen upon an enlarged scale the shaft `Gr with its rectangular casing The shaft is immediately surrounded by the tube or pipe S with which it revolves, and in which it slides with a spline and groove. The tube is driven by the cog wheel r and the shaft G revolves with it; the latter is fed through the tube by the screw T.

The boxing E is confined in its position by the-bars a and its distance from the `mandrel is regulated by the introduction of one 4or more plates or boards b of a known and exact thickness, by means of which the drill may be placed at the requisite distance from the center of the lathe for any required WhenV thus adjusted the drillis firmly secured in place by thescrews d. The drill is actuated and fed in a manner not differing essentially from that usually employed and need. not be particularly described. That the driving pulleys H and `the gearing immediately connected therewith may follow the drill as it is moved `to and from the mandrel these pulleys are attached toa piece f, which `slides in the carrying bracket I, andis confined in place by the set screw g.

K is the foot stock which slides upon the ways L, and carries the spindle C which isy broken away in Fig. l to show the drill D beneath ,it this drill which is mortised throughlrthe fo-ot stock as seen in Fig. 3 is `arranged-*1n a manner precisely similar to the other drill D and is allowed to move vertically in the mortise F plates or boards similar to Z), being used to determine the distance of this drill from the aXis of the lathe; the drill is fed and operated as in the former case, the driving pulleys and gearing being hung in a suspended frame M, Fig. 3, in order to adjust them to the varying positions of the drill; this frame is secured in position by the means of the screw m, and

slotn.

Operation: The tires of the drivers having been turned off the drills D, D are run up, the one through the face plate, the other through the foot stock and having been adjusted to equal distances from the axis of the lathe they are then set in motion and the holes are both bored at once The drills are in each case operated by a counter shaft separate -and distinct from that Which drives the lathe.

The casing which surrounds the shaft of the drill D requires .to be Withdrawn from the mortise in the face plate when the latter is to be used-the other drill D is simply retracted by its feeding screw T, a sutlicient distance to clear the Wheel.

What- I claim asmy invention and desire to secure by Letters Patent is- The drills D, D, in combination With the turning lathe, the one being mortised through the face plate, the other through the foot stock in the manner and for the purpose substantially as herein set forth.

J. M. STONE.

Witnesses:

SAM COOPER, lJOHN S. CLow. 

